The Truth About Tennis Kinetic Chain: The Approach Step Determines the "Power Build-Up" Effect in Your Serve

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Writing Context

What exactly is a tennis serve?SelectShangbu style,StillPlatformFormula?

Although this issue is often hotly debated among amateur players, from the author's observations, most tennis enthusiasts still opt for the stepping-stone serve—though at least they choose to use it.FormulaServe, adding to the surfaceDoneSwinging the batHeight,Capable ofGenerateGreater serving power.

ActuallyStanding at myAngle，The key to serving instruction is helping students understand and master how to engage their core muscles.(including hip joint flexibility and core stability, among others),AndThe movements of the appendicular skeleton—such as timing the swing and choosing the stepping motion—must be tailored to the player's individual habits.DynamicAdjustment

As long as a player's "personal habits" don't conflict with the "principle of commonality," there's no need to forcibly correct or assimilate them. After all, change always comes at a cost of time—so every bit saved will make a meaningful difference.OnePointsPrecisionEffort can be focused on key technologies.

So, the serving technique is simply a personal habit—whether one style is better than the other, or how to choose between them, isn’t something we’ll discuss here (but let’s armor ourselves with some defenses first!). Instead, the author will take a systematic approach, starting from the fundamental principles, to thoroughly address the two questions most amateur players have.Question：How should a stepping-up serve player properly execute the step? The incorrect way to step up isHow toDestructionServingGathering strengthWhose?

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The correct stepping technique

First, IThey team up with AlcarazOfUp-step serve,AnalysisQuickly take the correct next stepThe key points.

Alcaraz serves in slow motion

WeSure.Discovery，AlKallasShangbuFront and back，Two feetThe direction has not changed significantly.，AndAtShangbuHeel slightly together.——This is the correct next step.Commonality

If you look only atAlKaraSiTextbookFormulaOfShangbu StyleServingNot clear enough,SoPerhaps combining the following twoAmateurPlayerShangbuOfCommonProblem Explanation SessionMoreIntuitive

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Analyze the reasons for the error

First, we need to understand how the serving spin is generated.The correct serving pattern isThe hip joint on the front side first externally rotates to store energy, then internally rotates to release it—resulting in the player achieving maximum rotational velocity during the swing.

The Correct Pattern for Serving with a Rotational Motion

The anterior hip joint angle continues to decrease.

Common mistakes made by amateur players: stepping forwardMainly by methodThere isTwo types，One isCompleted upon stepping upDoneTwisting body，AnotherSeedIt's the rear-leg position that influences the push-off and takeoff.

Originally, it was a superposition of the angular velocities from the rotational movement and the racket swing—but during the stepping motion, the bodyThe spin has already been completed,ThenOnly canThroughSwinging the racketIncreaseServingSpeedDone——Failing to execute the turn effectivelyIsPracticeServingShoulderInjuredThe mainReasons

In the correct serving motion, the shoulderIsA structure that serves to transmit forceJoint, the shoulder muscles play a stabilizing role.

AtTwisting bodyInsufficiencyOfServingActionChina, due to the lack of angular velocity in the spin, the player's shoulderMuscleBoth have toAtAt the very beginningMaintainStability，AlsoToMomentRapidly forwardSwing your arms with powerful force,ThisWillWorsening shoulder injuries（Stability relies on the isometric contraction of muscles, while power comes from the concentric contraction of muscles—like pressing the brake and accelerator simultaneously, which can easily lead to vehicle breakdowns.The same logic. 🤦‍）

Another oneCommonQuestionIsShangbuAfter, the rear-foot condition affects bothFootPush off the ground and jump.AtPush off the groundTake offAt the time，Two feetForefootToJointSupporting the ground，By pushing off the ground upwardWillBodyPushEnterBatting zone

AtShangbuCompletedAt the time，On both sidesHipJointDemonstrating external rotationStatus，According to"The Hip, Knee, and Ankle" Three JointsCollinearOfPrinciple，At this moment, the player“Two feetToe tipOutward，HeelSlightlyAndGather“Easier on both feet”Push off the ground with the ball of your foot to jump upward.When storing energy, the hip joints on both the front and back sides rotate outward symmetrically, which helps players maintain balance in the "trophy pose."

The author usually relies on both feet.OfStatusCanGuessing the player's hipJointOfStatus，On topStepBack feetParallelOfConditionsBelow，At this momentHip areas on both sidesJointActuallyIsNoneSufficientlyOpenOf, limited inner-rotation space, twisting the bodyOfEfficiencyWill doBigHitDiscount

Feet crossed, with no internal rotation space available in the anterior hip joint.

On topStepWith feet crossed behindConditionsBelow，At this momentFront sideHipThe joint is in an internal rotation state,AlmostNoneSpace is being further processed.Internal rotation，AtThis kind ofShangbuPositioningBelowServing，EasySprainKneeOrAnkle

Therefore, when the previous step is completed, you must gently bring both heels together to open the front hip joints while maintaining your balance.